How do I mount the UWP mounting system?
First, position the UWP on the wall level and mark hole positions. Drill 7/32" holes for drywall and tap in supplied wall anchors. Insert wires through the wiring hole, place the UWP over the anchors, and tighten the mounting screws until it no longer moves—do not overtighten.
From the official Honeywell Lyric T6 Pro Wi-Fi Smart Thermostat manual, page 2
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